Water-tube boiler



g Patented Oct. 7, 193()Y UNITED STATES xINesLEY nfiviAn'rINgoFMoiv'rciinin, NnwJnnsEy i WATER-TUBE BOILEB application sied september5, i929. sprai Np. 390,520.

This invention relates to water tube boiler construction andparticularly to bailie walls as used in vertical boilers. The inventionhas for its primary object the provision oan 5 interrupted baffle wall(1) which will iinprove the eiiiciency and increase the capacity` of theboiler by securing the best distribution of the gases of combustion overtheheating surface of the boiler, and (2) which will pro-` `io videameans of readily modifying a baille installation to suit the workingconditions of the boiler as developed in operation. The invention isused to best advantage in `vertical boilers having cross baiiies'builtinaccordance'with Patent No. 1,702,933 issued to Alfred C. Danks andKingsley L. Martin. Certain embodiments of the inventionfare illustratedin the accompanying drawings, wherein:

` Figure 1 is a vertical` section through a vertical water tube boilerVshowing the location of the interrupted baille walls to which theinvention is applicable. Fig. 2 is a detail cross section through theinterrupted baffle and the first bank of tubes in which itiscustoinarily located as on the line II-II of Fig.

1. Fig. 3 is a detail eleva-tion of rone bank of tubes showing analternate method ofhconstructing the interrupted baiile withhorizontalinstead overtical open spaces.

By way of illustration, the baiiies are shown as applied to a Stirlingboiler, but it will be understood that the invention is applicable tothe other types of vertical boilers i and that the claims are applicableto all types unless otherwise limited by their terms.I

The boiler shown comprises the setting 1, l rebox 2, the three banks oftubes 3, 4 and 5, the drums 6, 7, 8, and 9, the front balile coni- 10prising the sections 10 and lland'the rear battle comprising thesections 12 rand 13, the sections 1() and 12 extending longitudinally ofthe tubes and the sections 11 and 13 extending transversely of thetubes. 'lhe interrupted baffle 14 also extends lengthwise .of the tubesin an upward direction from the cross baille wall 11 and may be locatedeither on the first bank 3, as shown 'in Fig. 3, orbetw-een the tubes asshown in Fig. 2.

Fig. 2 showsthe construction of the interi rupted baiiiewithlongitudinallspaces asfit f 1 y.

extends longitudinally of the tubes above the upper cross baille 11. Asshown in this fig-1 ure, the.alternatespaces A and B between the tubesare made` widean-d narrow, respec` tively, ,in accordance"with` the`regular prac tice;` the `wide spaces being designed to give `room`forthe removal of v tubes when it bei comes necessary to take -themoutAfor `re `soll Fig.; 3, shows the` interruptedbaiile constructed. withhorizontal .spaces 16, the preferredginethod beingl touse horizontalangles 17 clamped to `a row offtubes and supporting molded refractory pblocks `18. The distance` p between the angles'and the width `of the B0blocks `maybe designed originally to meet expected conditions and laterchanged withf out :undueexpense if found desirable;4 c The Vadvantagesof the interruptedbaie will be readily apparent to thoseskilled in s"the art. With` certain boilers4 having `superheaters` similarto 19 vofunusual length,.itis j i necessary to locate the cross baile 11 low jdown on the tube banks 33.and,4.to avoid curtai'ling the superheaterarea. In such cases, the gases do notv iood the upper end of tube bank3,but may follow the cross baffle 11 and render the valuable heatingsurface at the upper end of the tube bank 3 ineffective.

A marked improvement in boiler operation is d obtained by the use of aninterrupted baftle, assliown, which permits part of the gas to passthrough the open spaces to the lower end of' the superheater and to thatpart of the second tube bank 4 immediately above cross PATENTgoFFicE* 4v ient length itting back `to `back between the' U5 baiiie 11, butforces the remainder of the gas to the upper end of the first bank oftubes 3, the upper end of superheater 19 and the upper end of the secondbank of tubes 4.

The distribution of the gas more evenly over the superheater instead ofpermitting heat concentration on its lower end, is also a markedadvantage in securing higher superheat and'longer life of thesuperheater elements. It has been found in practice that the momentarydraft restriction is not suiiicient to be objectionable, while thedecrease in temperature of the gases leaving the boiler is materiallylower, eiiecting a very substantial saving in fuel. I

lVhat I claim is:

1. In combination in a vertical water tube boiler, comprising aplurality of steam and water drums, a mud-drum and a plurality of banksof tubes connected between said steam' and water drums and saidmud-drum, a superheater located between the first and second banks oftubes and a baH'le wall built in part longitudinally of the lowerportions of the tubes of the first bank and in part transverse of thesaid tubes and an extension of the longitudinal baiiie extending partway to the upper drum and in front of a portion of said superheater andcomprising a plurality of spaced portions to provide openingstherebetween whereby some of the gases pass through said openings andall of the furnace gases are distributed more evenly over the elementsof the superheater.

2. In combination in a water tube boiler of the vertical type havingVupper drums and a lower drum, and a plurality of banks of tubesextending between the upper drums and the lower drum, a bailie wallhaving a section of imperforate construction extending upward from' thelower drum longitudinally of the tubes of the irst bank and a sectioneX- tending transversely of such tubes, a super heater located betweenthe iirst and secondV banks above the second section of baile, and anextension of the baiiie also extending upward longitudinally of thetubes part way to the upper drum and in front of a portion of suchsuperheater and comprising a plurality of spaced portions to provideopenings therebetween.

In testimony whereof, I have hereunto subscribed my name this 28th dayof August,

KINGSLEY L. MARTIN.

